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Composite separation membrane

Inactive Publication Date: 2011-01-27
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]According to the present invention, a composite separation membrane can be provided which has excellent chemical resistance and water permeability, and the industrial improvements of reduction in running cost, reduction in cost, and energy saving are expected through the use of this membrane.

Problems solved by technology

However, this membrane has problems with hydrolysis resistance, microbial resistance, etc., and is also insufficient in salt removal rate and water permeability.
Therefore, the cellulose acetate asymmetric membrane has not been put to practical use yet in a wide range of applications, while the membrane has been used for some applications.
However, such a composite separation membrane using a polyamide includes an amide linkage in its main chain, and thus still has insufficient chemical resistance, and it is known that the desalination performance and selective separation performance are significantly degraded due to a treatment with chlorine, hydrogen peroxide, etc., for use in sterilization of the membrane.
However, the composite separation membrane produced with the use of a vinyl based compound as described above has excellent chemical resistance, it can hardly be said that either water permeability or separation performance is sufficient.
However, the gas separation membranes described above which have significantly low water permeability are not able to be used as separation membranes for water treatments, because separation membranes for water treatments are required to satisfy all of water permeability, separation performance, and physical durability and chemical durability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0047]The porous supporting membrane reinforced with a fiber, used in the present invention, was produced in accordance with the following approach.

[0048]Taffeta (150-denier multifilament yarn for both warp yarn and weft yarn, weaving density: 90 yarns / inch in the length direction and 67 yarns / inch, thickness: 160 μm) composed of a 30 cm long×20 cm wide polyester fiber was fixed to a glass plate, and a 15 weight % dimethylformamide solution of polysulfone (Udel (Registered Trademark) produced by Amoco, P-3500) was casted thereon at room temperature (25° C.) to provide a thickness of 200 μm, immediately followed by immersion in pure water and leaving as it was for 5 minutes, thereby obtaining a porous supporting membrane. The pure water permeation coefficient of the thus obtained porous supporting membrane was 0.005 to 0.01 kg / cm2 / sec / atm (about 0.001 to 0.002 g / cm2 / sec / MPa), which was measured at a pressure of 0.1 MPa and a temperature of 25° C. In addition, the average pore size at...

example 1

[0049]The porous supporting membrane produced in accordance with Reference Example 1 was brought into contact with an isopropyl alcohol solution containing 3.6 weight % of sodium styrenesulfonate, 0.4 weight % of Methacryl-POSS (polyhedral oligomeric silsesquioxane), 0.24 weight % of 2,2-dimethoxy-2-phenylacetophenone as an α-hydroxyacetophenone type photopolymerization initiator, and 33.5 weight % of pure water for 1 minute, and nitrogen was sprayed from an air nozzle to remove the extra solution from the surface of the porous supporting membrane, thereby forming a layer of the solution on the porous supporting membrane. Then, with the use of an excimer lamp (UER 20-172) produced by Ushio, inc., capable of irradiation with ultraviolet rays of 172 nm, the distance between the excimer lamp and the porous supporting membrane was set to 1 cm under a nitrogen atmosphere with an oxygen concentration of 0.1% or less, and irradiation with ultraviolet rays was carried out for 5 minutes to p...

example 2

[0050]A composite separation membrane was produced in the same way as in Example 1, except that an isopropyl alcohol solution containing 1.8 weight % of an acrylic acid, 0.2 weight % of Methacryl-POSS, and 0.12 weight % of 2,2-dimethoxy-2-phenyl acetophenone was used instead of the solution applied onto the porous supporting membrane in Example 1. The thus obtained composite separation membrane was evaluated in the same way as in Example 1 to obtain the performance shown in Table 1.

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PUM

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Abstract

In order to obtain a composite separation membrane which has excellent chemical resistance, separation performance and water permeability at the same time, the present invention provides a composite separation membrane comprising a separation function layer on a porous supporting membrane, characterized in that the separation function layer contains at least a polymer of a polyhedral silsesquioxane represented by the following general formula (a) and a hydrophilic monomer.(R1SiO1.5)n(R2SiO1.5)m  General Formula (a)(In the formula, R1 includes a polymerizable reactive moiety; R2 represents a hydrogen atom or an alkyl group, which may be substituted; and n and m each represent an integer satisfying n≧2 or m≧0, with n+m being 8, 10 or 12.)

Description

TECHNICAL FIELD[0001]The present invention relates to a composite separation membrane which has excellent chemical resistance, separation performance, and water permeability.BACKGROUND ART[0002]Conventionally, separation membranes which have been used industrially include an asymmetric membrane from cellulose acetate (for example, Patent Document 1). However, this membrane has problems with hydrolysis resistance, microbial resistance, etc., and is also insufficient in salt removal rate and water permeability. Therefore, the cellulose acetate asymmetric membrane has not been put to practical use yet in a wide range of applications, while the membrane has been used for some applications.[0003]In order to correct these defects, a composite separation membrane which has a porous membrane coated with a separation function layer which is a different material and substantially responsible for membrane separation performance has been created as a separation membrane which differs from the a...

Claims

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Application Information

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IPC IPC(8): B01D71/70
CPCB01D69/125B01D69/12B01D2323/02B01D2325/36B01D71/70B01D69/10B01D69/1213B01D71/702B01D2325/02832B01D2325/02833B01D2325/04B01D69/1214B01D69/1071
Inventor OKABE, JUNTOMIOKA, HIROKIHENMI, MASAHIRO
Owner TORAY IND INC
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